my back up lights havent been comming on since i did my rebuild and always just thought it was an unplugged connection on the tranny. well i crawled on under and checked everything, and theyre all good. no direct fuse for the back up lights and no blown fuses so unless both bulbs burned out at the same time, im stumped. any ideas? while i was under i realized most my driveshaft bolts had rattled to finger tight, took to opportunity to avoid that disaster

 

check at the light to see if its grounded, you may have a bad ground. put the tranny in reverse and see where your not getting power.